Registers – Coded record sensors – Particular sensor structure
Patent
1992-12-23
1994-09-13
Hajec, Donald
Registers
Coded record sensors
Particular sensor structure
235487, 359 2, 283 86, 283 90, G06K 1900, B42D 1500
Patent
active
053471113
ABSTRACT:
For the purpose of identifying the authenticity of an article, an incident detecting light beam having a certain wave length and a polarization plane extending in a certain direction is projected from a light emitting element, and the plane of polarization of this incident light is rotated by 90.degree. as it impinges upon and reflected by an identification region having a specific reflective directivity owing to its diffractive property, and the reflected linearly polarized light is received by a light receiving element which is capable of recognizing the diffractive property via a polarization filter oriented so as to receive only the light having a plane of polarization perpendicular to that of the incident light. According to this structure, it is practically impossible to detect that this region is being used as such an identification region or to understand the structure for identification without analyzing the light emitting and receiving unit because the rotation of the polarization plane is determined merely by selecting the thickness and the optical property of the normally used material. Further, since the optical identification unit is not normally available to a potential counterfeiter, an unauthorized duplication is extremely difficult.
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Filipek Jeffrey R.
Hajec Donald
NHK Spring Co. Ltd.
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